/Engine/Plugins/Online/OnlineSubsystem/Source/Public/Interfaces/OnlineMessageInterface.h
Find an attribute by name and get its value
true if attribute was found
bool GetAttribute ( const [FString](API\Runtime\Core\Containers\FString) & AttrName, [FVariantData](API\Plugins\OnlineSubsystem\FVariantData) & OutAttrValue ) const